Rock bit cone wrench



May 9, 1933. F. M. OWEN 1,907,658

ROCK BIT come: WRENCH Filed April 27, 1951 29 27 iyl. 22 flllLgl lllfl mmnummnm..|..|,,,,, IIIIIIIIIIHHIIIM"'""""" llllllllllllllllllll lll I N VEN TOR. 519/716 M One/2 A TTORNEY.

Patented May 9, 1933.

UNITED STA PATENT OFFICE FRANK M. OXVEN, OF OKLAHOMA CITY, OKLAHOMA, ASSIGNOR ONE-HALF ZIO AMERICAN IRON AND MACHINE WORKS COMP-ANY, OF OKLAHOMA CITY, .OKLEA- HOMA, A CORPORATION OF OKLAHOMA ROCK BIT CONE WRENCH Application filed April 27,

This invention relates to wrenches and more particularly to a wrench for assembling and disassembling rock bits employed in well drilling operations, the principal objects of the invention being to provide a wrench for readily manipulating the through bolts which retain the sections of a bit together and for removing the cones from the sections without danger of injury to the operator due to flying pieces chipped from the cone.

In accomplishing these and other objects of the invention, I have provided improved details of structure, the preferred form of which is illustrated in the accompanying drawing, wherein:

Fig. 1 is a side elevational View of a wrench constructed in accordance with my invention, illustrating its application to the through bolts of a rock bit. 1

Fig. 2 is a similar view of the wrench illustrating its application to one of the cones of the bit, a part of the Wrench head being broken away to better illustrate its engagement with the cone.

Fig. 3 is a sectional View on the line 3 3, of Fig. 2, particularly illustrating engagement of the cone lock pin with the wrench head.

Fig. 4 is an enlarged sectional view on the line 4-4: of Fig. 2, illustrating the relation of the teeth on the Wrench head with the teeth of the cone.

Fig. 5 is a detail perspective view of the wrench particularly illustrating the teeth for engaging teeth of the bit and the T shaped slots for receiving the lock pins of the cone bit.

Referring in detail to the drawing:

1 designates a cone type rock bit comprising mated sections 2 and 3 secured together by through bolts 4 projecting through open ings 5 in the section 3 and into threaded openings 6 in the section 2, the bolts being provided with the usual slotted heads 7. The lower ends of the sections are beveled as at 8 and 9 and projecting therefrom are threaded bosses 10 for receiving cone-shaped bearing heads 11 having a. peripheral shoulder 12.

13 and 14 designate cones rotatably mounted on the heads 11 and are retained thereon 'tion.

'but'is illustrated'to better describe the appli- 1931. Serial ,No. "53.3 ,0.5,3.

by rings 15' threaded into the sockets 1 6 of the cones to engage theshoulders jl 2onlthe heads 11 to retain the cones in .rotative posi- The cones 13 and :14 are zilsoprovidedwith threaded openings 17 in their peripheries to receive threadedflock pins 18,1ater described.

The structure thus, far described is of standard rock'bit construction and specifically 'formsno part ofthe present invention being directed to the clearance reserved between the cone teeth andteeth of the wrench f ap r- Formed in the flange 22 at diametrically opposite points-are T-"shaped slots 26 and 27 .75 to perm'it limited rotational movementof the 1 fwrench independently of the cone .pose presently described.

The vertical portions 28 of the slots extend through the baseot the rim andare of sufficient width to permit reception of the lock pins18 when applying the wrench so that upon initial rotationof the wrenchthe pin may enter in either ofthe socket portions 29 or 30 tolock'the wrench with a cone, as best illustrated in Fig. 2. v

Formed at the apex of-the 'cone is a rectangular shaped lug 31 adapted to-engage in the slottedhead of the through bolts as later described.

The Wrench is provided with a radially extending handle 32 preferably integral with the rim22-and provided onitsouter end with a ball-like enlargement 33, ,asshown linFigs. 1 and 2.

In disassembling a'bit with a wrench constructed as described, the wrench is applied as shown in lso that the lug3 l engages the teeth formed on the rim of the wrench in the slotted head of the through bolts and by rotating the handle the bolts may beloosened to permit separation of the bit sections. After the sections have been separated the cone-shaped body portion of the Wrench is applied over the cone bits as shown in Fig. 2 so that the teeth of the cone intermesh with and the lock pin 18 enters one of the slots 2601' 27 The Wrench is then slightly rotated to move the lock pin into either of the socket portions 29 or 80 to lock the wrench to the cone and thereafter the cone may be unscrewed from the boss 10 by rotating the wrench in the proper direction.

Sharpencd cones may be applied to the freely engaging the teeth of the bit to permit limited rotational movement of the wrench independently of the cone to effect locking engagement of the lock-pin in said slot, and means on the head for effecting rotation of the head.

In testimony whereof I afiix my signature.

FRANK M. OWEN.

body portions of the bit by reversing the operation and the through bolts tightened to retain the sections by applying the lug 31 of the wrench in the slotted heads of the bolts and rotating the Wrench in the proper direction to tighten the threads.

.It is apparent that the cone-shaped body portion of the Wrench provides a shield to prevent portions of the teeth, fractured incidental to removal of the cones, from flying off and injuring the operator of the Wrench.

It is also apparent that the teeth on the rim provide a positive grip for the Wrench entirely around its periphery and that the T-shaped slots engaging with the lock pins,

' lock the Wrenchon the cone during manipulation of the device.

' What I claim and desire to secure by Letters Patent:

. 1. A wrench for cone bits comprising'a head having a cone-shaped shield portion to receive a cone of a bit, a circumferential flange on the head having a T-shaped slot head havinga cone-shaped shield portion to 7 receive a cone of a bit, a circumferential flange on the head having a slot for receiving a lock-pin on the cone to anchor the wrench to the cone, teeth on thefiange for freely engaging the teeth of the bit to permit limited rotational movement of the wrench independently of the cone to effect locking engagement of the lock-pin in said slot, and

means on the'head for effecting rotation of the head.

"3. A Wrench for cone bits comprising a head having a cone-shaped shield portion to receive a cone of a bit, a circumferential flange on the head having a bayonet slot for receiving a lock-pin on the cone to anchor the Wrench to the cone, teeth on the flange for ies 

